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POUsing Google Guice to inject java properties
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  1. POUsing Google Guice to inject java properties
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    copied!<p>I want to use google guice to make properties available in all classes of my application. I defined a Module which loads and binds the properties file <em>Test.properties</em>.</p> <pre><code>Property1=TEST Property2=25 </code></pre> <p>package com.test;</p> <pre><code>import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.Properties; import com.google.inject.AbstractModule; import com.google.inject.name.Names; public class TestConfiguration extends AbstractModule { @Override protected void configure() { Properties properties = new Properties(); try { properties.load(new FileReader("Test.properties")); Names.bindProperties(binder(), properties); } catch (FileNotFoundException e) { System.out.println("The configuration file Test.properties can not be found"); } catch (IOException e) { System.out.println("I/O Exception during loading configuration"); } } } </code></pre> <p>I'm using a main class where I create a injector to inject the properties.</p> <pre><code>package com.test; import com.google.inject.Guice; import com.google.inject.Injector; public class Test { public static void main(String[] args) { TestConfiguration config = new TestConfiguration(); Injector injector = Guice.createInjector(config); TestImpl test = injector.getInstance(TestImpl.class); } } package com.test; import com.google.inject.Inject; import com.google.inject.name.Named; public class TestImpl { private final String property1; private final Integer property2; @Inject public TestImpl(@Named("Property1") String property1, @Named("Property2") Integer property2) { System.out.println("Hello World"); this.property1 = property1; this.property2 = property2; System.out.println(property1); System.out.println(property2); } } </code></pre> <p>Now my question. If my TestImpl creates other classes where I also need to inject properties, and those classes also need to inject properties what is the correct way to do this?</p> <ol> <li><p>Pass the injector to all subclasses and then use injector.getInstance(...) to create the subclasses?</p></li> <li><p>Instanciate a new injector like</p> <pre><code>TestConfiguration config = new TestConfiguration(); Injector injector = Guice.createInjector(config); TestImpl test = injector.getInstance(TestImpl.class); </code></pre></li> </ol> <p>in all nested classes?</p> <ol> <li>Is there an other approach to make the properties available in all classes? </li> </ol>
 

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